The city medical examiner was expected to perform an autopsy Tuesday on Russia's ambassador to the United Nations, who died a day earlier after falling ill at his office at Russia's U.N. mission.

Spokeswoman Julie Bolcer said the case was referred to the office by the hospital. The medical examiner is responsible for investigating deaths that occur by criminal violence, accident, suicide, suddenly or when the person seemed healthy, or if someone died in any unusual or suspicious manner. Most of the deaths investigated by the office are not suspicious.

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Vitaly Churkin, who died a day before his 65th birthday, had been Russia's envoy at the United Nations since 2006. He was the longest-serving ambassador on the Security Council, the U.N.'s most powerful body.

The Security Council held a moment of silence Tuesday in memory of Churkin, whom U.N. Secretary-General Antonio Guterres called "not only an outstanding diplomat but an extraordinary human being."

Russian President Vladimir Putin esteemed Churkin's "professionalism and diplomatic talents," spokesman Dmitry Peskov said, according to the state news agency TASS. Moscow has not yet given a date for the funeral.

Diplomatic colleagues from around the world mourned Churkin as a master in their field, saying he had both a deep knowledge of diplomacy and a large and colorful personality.

U.S. Ambassador Nikki Haley said that while she and Churkin did not always agree, "he unquestionably advocated his country's positions with great skill."

Her predecessor, Samantha Power, described him on Twitter as a "diplomatic maestro and deeply caring man" who had done all he could to bridge differences between the U.S. and Russia.

Those differences were evident when Power and Churkin spoke at the Security Council last month, and Power lashed out at Russia for annexing Ukraine's Crimean Peninsula and for carrying out "a merciless military assault" in Syria. Churkin countered that Democratic former President Barack Obama's administration, which Power served in, was "desperately" searching for scapegoats for its failures in Iraq, Syria and Libya.

Churkin died weeks into some major adjustments for Russia, the U.N. and the international community, with a new secretary-general at the world body and a new administration in Washington. Meanwhile, the Security Council is due this week to discuss Ukraine and Syria.

From Moscow's vantage point, "Churkin was like a rock against which were broken the attempts by our enemies to undermine what constitutes the glory of Russia," TASS quoted Deputy Foreign Minister Sergei Ryabkov as saying.

Churkin's U.N. counterparts "experienced and respected the pride that he took in serving his country and the passion and, at times, very stern resolution that he brought to his job," said General Assembly President Peter Thomson, of Fiji. But colleagues also respected Churkin's intellect, diplomatic skills, good humor and consideration for others, said Thomson, who called for a moment of silence at the start of an unrelated meeting Monday.

Churkin emerged as the face of a new approach to foreign affairs by the Soviet Union in 1986, when he testified before the U.S. Congress about the Chernobyl nuclear plant disaster. It was rare for any Soviet official to appear before Congress.

In fluent English, Churkin provided little new information about Chernobyl but engaged in a friendly, sometimes humorous, exchange with lawmakers who were not accustomed to such a tone — or to a representative in a fashionably well-fitting suit and a stylish haircut — from the Soviet Union.

After he returned to the foreign ministry in Moscow, he ably dodged questions and parried with Western correspondents, often with a smile, at briefings in the early 1990s. Within the government, he proved himself an able and flexible presence who survived numerous course changes after the dissolution of the Soviet Union. He held ambassadorships in Canada and Belgium, among other posts.

Churkin told Russia Today in an interview this month that diplomacy had become "much more hectic," with political tensions rising and stability elusive in various hotspots. At the time, he looked in good health, reporter Alexey Yaroshevsky tweeted Monday.

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Associated Press writers Edith M. Lederer in London, Cara Anna in Johannesburg and James Heintz and Brian Friedman in Moscow contributed to this report.